Carburetor for internal-combustion engines



.Aug. 16, 1927.

1,639,396 C. CARLSSON CARBURETOR FOR INTERNAL COMBUSTION ENGINES FiledAbril 23, 1925 Patented Aug. 16, 1927.

UNETEDJ STATES CARL Gan sta, or smecxaom, swan.

CARBU'RETORFOR mgrnnnan-oorinus'rron ENGINES.

Application filed April 23,1925, Serial No. 25,286, and in SwedenFebruary 21, 1525.

The present invention consists of a car buretor, or a devicefor intmately mlxing hquld fuel with air, fornternal combustion engines or thelike, of such construction,

entire device, Fig. 2 a view from above of the piece (10 of Fig. 1),called the venturi, and Fig. 3 a longitudinal section of the valve (thecock valve 9 of Fig. 1).

Referring to theFig. 1, the device of the invention consists of a floatchamber or receptacle for the fuel 1, a chiefiy cylindrical casing 2,communicating with the float chamber 1 by means of an inlet 3, leadingto a vertical channel it in the wall of the casing 2 and closed at itsbottom by a screw stopper. From the side of this channel 4- anotherchannel 5 branches out, running, generally horizontally, into the centreof the device and communicating with an upright nozzle 6, situated inthe middle of thecentral cavity of the casing 2. This nozzle 6 is at itsupper or outlet end provided with a choke-tube 7 in the shape of ahollow cylinder whose walls are thickest at the. middle and narrowingout towards both ends of the cylinder. This choke-tube 7. is fixed tothe top of the nozzle 6 by means of thin brackets. In the upper end ofsaid channel 4 is provided another nozzle 8, opening into a valve 9,generally a cock valve, which, communicates with an annular channel 11,cut out in the outer cylindrical surface of the venturi 10. The casing?has further an air inlet 13, conveniently on thes'ide opposite to thefloat chamber, and at the top an outlet 14 for the mixture'of air andfuel. This outlet is controlled by a throttle valve 15, which by meansof a rod 16 or some other known device is connected with the cock valve9 in such manner, that both valves open and shut simultaneously. Thecock,

valve 9 is generally cylindrical, Fig. 3, and at one end partly cut out,17, in order to communicate;when" in a certain position or when it isopen,- with the annular channel 11. The other-end, 18, of this valve isopen to let in air, and the cut out, 17, allows the e'n'tranceof thenozzle8. a I y i The construction of the device being thus fullydescribed, it works in the following manner; The oil or other liquidfuel runs from the float chamber 1 through the outlet 3 into the channel4. There it divides, part ofit passing through the channel 5 and thenozzle 6, being when leaving the latter finely dispersed by the airsucked in from the air inIet lS through the cylindrical choke-tube 7between the brackets. Another part of the fuel inthe channel {L passesthrough the nozzle 8 into the valve 9 and, if this valve is open, thatis with the cut out 17 turned to the right (in the Fig. 1), into theannular cliannel 11 together with air, sucked in through the open end18of thevalve 9. From there it is forced out through the openings 12 ofthe venturi 1O. These openings preferably being widening outwards, fromthe annular chamber, the mixture of air and fuel is very well mingl'e:d.This mixture is .here met by the air fronith-e inlet 13, having passedoutside of the cylindrical choke-tube 7, and by themixmr'e' of and fuelcoming from the nozzle 6. Bythis arrangement is effected an exceedinglythorough and intimate mingling of the fuel and the air and at the sametime a perfect evaporation of the liquid fuel, pjarticularly'well suitedto the requirements of an internal combustion engine.

The inventlon is susceptible to various changes in itslform,proportions, and minor detailsbf construction, and the right is hereinreserved to make such changes as properly fall within the, scope of theappended claims, v

,Having described the invention, what I claim is: I

l. A carburetor for mixing liquid fuel with air ,,consisting of apreferably chiefly cylindrical, hollow casing with an upright nozale inits centre, and provided with an air inlet and an outlet, said nozzlecommunicating withya' float chamber by means of a channel; the cavity ofsaid hollow casing being narrowed around the outlet opening of saidupright nozzle by means of a separate venturi; said channel from thefloat chamber to said upright nozzle branchi-ng out into a channel inthe wall of the i iii) said hollow casing, the last named channelopening by means of a nozzle into the interior of a hollow valve thatcontrols a channel communicating with holes in the said venturi, saidholes opening into the interior of the venturi.

2. A carburetor for mixing liquid fuel with air, consisting of apreferably chiefly cylindrical, hollow casing with an upright nozzle inits centre, and provided with an air inlet and an outlet, said nozzlecommunieating with a float chamber by means of a channel; the cavity ofsaid hollow casing eing narrowed around the outlet opening of saidupright nozzle by means of a separate venturi; in combination with achoketube open at each end, and surrounding and fixed to the upper endof said upright nozzle and whose inside diameter is widening towardseach end; said channel from the float chamber to said upright nozzlebranching out into a channel in the wall of the said hollow casing, thelast named channel opening by means of a nozzle into the interior of ahollow valve that controls a channel communicating with holes in thesaid venturi, said holes opening into the interior of the venturi.

3. A carburetor for mixing liquid fuel with air, consisting of apreferably chiefly cylindrical, hollow casing with an upright nozzle inits centre, and provided with an air inlet and an outlet, said nozzlecommunicating with a float chamber by means of a channel; the cavity ofsaid hollow casing being narrowed around the outlet opening of saidupright nozzle by means of a separate venturi, in combination with achoke-tube open at each end, and surrounding and fixed to the upper endof said upright nozzle and whose inside diameter is widening towardseach end; said channel from the float chamber to said upright nozzlebranching out into a channel in the wall of the said hollow casing, thelast named channel opening by means of a nozzle into the interior of ahollow cylindrical cock valve that controls a channel leading to anannular channel in the said venturi by means of a cut-out in the'wall ofthe valve, said annular channel communicating with holes in the saidventuri, said holes opening into the interior of the venturi.

4. A carburetor, for mixing liquid fuel with airconsisting of acylindrical, hollow casing with an upright nozzle in its centre, androvided with an air inlet and an outlet, said nozzle communicating bymeans of a hollow cylinder open at each end, surrounds ing and fixed tothe upper end of said upright nozzle, the walls of said cylinder beingthicker in the middle part and narrowing out towards each end, saidchannel from the float chamber to said upright nozzle branching out intoa vertical channel in the wall of said hollow casing, said verticalchannel opening, by means of a nozzle, into a cylindrical cock valve,this valve communicating, when open, with an annular channel in saidventuri, said annular channel surrounding the top of said uprightnozzle, said valve being provided with a cut-out for the communicationwith said annular channel and open to the outer air its other end, saidannular channel having a number of openings into the upper interior partof said venturi.

5. A carburetor for mixing liquid fuel with air, consisting of apreferably chiefly cylindrical, hollow casing with an upright nozzle inits centre, and provided with an air inlet and an outlet, said nozzlecommunieating by means of a channel, with a float chamber, the cavity ofsaid hollow casing being narrowed around the outlet opening of saidupright nozzle by means of a separate venturi, in combination with achoke tube in the shape of a hollow cylinder open at each end,surrounding and fixed to the upper end of said upright nozzle, the wallsof said cylinder being thicker in the middle part and narrowing outtowards each end, said channel from the float chamber to said uprightnozzle branching out into a vertical channel in the wall of said hollowcasing, said vertical channel opening, by means of a nozzle into acylindrical cock valve, this valve communicating, when open, with anannular channel in said venturi, said annular channel surrounding thetop of said upright nozzle, said cock valve. provided with a cut-out forthe communication with said annular channel and open to the outer air atits other end, said annular channel having a number of openings into theupper interior part of said venturi, said'openings widening out from theannular channel.

In testimony whereof I have hereunto affixed my signature.

CARL CA RLSSON

